Electric time-alarm.



No. 871,553. PATENTBD NOV. 19, 1907.

F. J. ARNDT.

ELECTRIC TIME ALARM.

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F. J. ARNDT. ELECTRIC TIME ALARM.

APPLICATIOI FILED AUG. 1| 1906.

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UNITED STATES PATENT OFFIOE.

FREDERICH J. ARNDT, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO AMERICAN BANKi ELECTRIC TME-ALARM.

Specicaton of Letters Patent.

Patented Nov. 19, 1907.

Application filed Augustll 1906. Serial No. 328.710.

To all whom it may concern:

Be it known that I, FREDERICH J ARNDT, of Minneapolis, Hennepin county,Minnesota, have invented certain new and useful Improvements f, inElectric Time-Alarms, of Which the following is a specification.

My invention relates to burglar alarm systems of the clock or automaticcircuit closer type, and the primary object of my invention is toprovide an adjunct to the mechanism shown and described in LettersPatent of the United States issued to William H. Robins and John F.Jacoby, October 4, 1904', No. 7 71 ,748.

The invention consists generally in providing means for causing thealarm circuit to be kept on or in service on Sunda after the clockmechanism has passed out o service at the usual hour in the morning.

Further, the invention consists generally in various constructions andcombinations, all as hereinafter described and particularly pointed outin' the claims.

In the accompanying drawings, forming part of this specification, Figure1 is a detail view of a time piece with my invention applied thereto.Fig. 2 is a detail view showing the position of the alarm circuitbrushes and the means for closing the circuit between them on Sunday.Fig. 3 is a detail view showing the brushes in the act of passing oflthe clock contact plates early Sunday morning and the mechanism about toclose the gap between the brushes during the day. Fig. 4 1s a similarview illustrating the circuit closer in contact with the brushes andclosing the circuit between them.

In the drawing, 2 re resents the clock dial having its face suitab ymarked to indicate the night space and 3 and 4 the minute and hour handsrespectively arranged in substantially the same manner as shown in thepatent above referred to. A rotating disk 5 is mounted in the rear ofthe hands and provided With a contact plate 6 and slot 7 through which apin 8 extends connecting the hour hand with the gear 9 beneath. Acontact plate 10 is mounted on the gear and is adapted to slip back andforth over the plate 6 for the purpose of increasing or decreasing thelength of the contact surface. Reminder plates 11 are inserted in theperiphery of theldisk 5, all substantially as ysoon be closed.

shown in the patent to Robins and Jacoby, and are for the purpose ofclosing an auxiliary circuit and sounding an alarm to remind theattendant or other person in charge of the vault that the general alarmcircuit will A graduated disk 12 is provided, by the adjustment of whichthe time and length of contact is regulated. This is also shown in theabove described patent and I make no claim to the saine herein.

The alarm circuit brushes 13 and 14 are mounted on an insulating block15 and are adapted to bear on the contact plates during the revolutionof the disk, the contact plates serving to close the circuit between thebrushes so that during the time the clock is on or in circuit at night,any tampering with the bolts or locks or the line wires will cause thealarm to be sounded at the gong. The insulating disk is set so that at acertain predetermined hour of the day, usually six oclock, the brusheswill pass on to the contact plates and the circuit Will be closedbetween the brushes for a certain predetermined time, usually .the next12 hours or until six oclock in the morning. the brushes will ass offthe contact plate and the clock willbe out of circuit during the day. Itis desirable, however, on such days as Sunday occurring at regularintervals each week, to provide some means for keeping the clock incircuit or on the entire day as well as the preceding and followinnights. I therefore provide a star wheel lIi series of rongs 17 markedto indicate the days of t e week. The wheel is mounted upon a shaft 18and has a ratchet 19 in position to engage a circuit closing spring 20mounted upon a pin 21 and havmg a downwardly turned point 22 adapted toenter a hole or socket 23 between the brushes 13 and 14 and close thecircuit between them. A spring 24 normally tends to hold the circuitclosing spring in engagement With the brushes. The opposite end 25 ofthe circuit closing spring engages the ratchet teeth and the spring isnormally held in an elevated position out of contact with the brushes,but a notch 26 is provided in said ratchet, deeper than the others andconsequently with every revolution of the ratchet the spring is allowedto drop lower than at other times and the notch is made sufficientlydeep to allow At this time aving a the spring to swing down between thebrushes and contact therewith. The notch in the ratchet is so arrangedthat when the prong bearing the mark Sunday is opposite the notch 27inthe clock dial, the circuit closing mechanism of the'clock will be4 onthe point of passing out of circuit o'n Sunday morning and the circuitclosing spring will drop into the deeper notch and swing down betweenthe brushes and closethe circuit at that point. tomatically one stepeach day and to accomlish this I prefer to provide an arm 28 on the baseof the hour hand in position to contact with the prongs of thestar wheeland revolve it one step with each complete revolution of the hand on thedial. y

From the foreoging it will be noted that when the star wheel is properlyset the circuit will be closed between the brushes automatically Sundaymorning just before the brushes pass 0H the contactplates and the clockgoes out of circuit for the day, and the circuit between the brusheswill remain closed during the, day and the following night or until suchtime as the clock goesv 1. The combination, with a time mechan-` ism, ofan 'electric circuit, a primary circuit closer having brushes normallyinsulated from one another and a rotary disk having insulating andconducting vsurfaces with which said brushes alternately engage, thelength of said conducting surface determining the time during which theycircuit is closed through said time mechanism, and a secondary circuitcloser including a Ipivoted spring arran ed to bear on said brushes andadapted to c ose the circuit by day at predetermined intervals and whenthe circuit is f broken throu h said primary circuit closer.

2. The com ination, with a time mechanism, of an electric circuit, aprimaryl circuit closer having brushes normally insulated from oneanother, and a rotary disk having insulating and conducting surfaceswith which said brushesalternately engage, the length of the conductingsurface determining the time during which the circuit is closed throughsaid time mechanism, the circuit closing device havinfy a uniformregular movement during siX days-of the Week The star wheel is revolvedauand an abnormal movement on the seventh day, and means actuated fromthe hour hand post for operating said circuit closing device andimparting a normal and abnormal movement thereto, substantially asdescribed. f

3. The combination, with a time mechanism, of an electric alarm circuit,a primary circuit closer arranged to close the circuit through saidmechanism by night and open it by day, an arm connected with the hourhand post a revolving device having means representing the days of theWeek and located in thel path of said arm and actuated thereby onestep'with each revolution of said hand, and means controlled by themovesaid alarm circuit through said time mechanism once with everyrevolution of said revolving means or every seventh day.

4. The combination, with a time mechanism, of an electric alarm circuit,a primary circuitcioser comprising a rotary disk having insulating andconducting surfaces and brushes forming the terminals of said alarmcircuit arranged to bear on said insulating and conducting surfaces, thelength of said ment of said revolving means for 'closing conductingsurface determining the time Y during which the circuit is closedthrough said time mechanism, said disk being adjustable to permit thehour in which the circuit is first closed through said mechanism to bevaried, and a secondary circuit closer arranged to close the circuit byday at predetermined intervals and when the said circuit is brokenthrough said primary circuit closer.

5. The combination, with a time mechanism, of an electric alarm circuit,a primary circuit closer arranged to close the circuit through saidmechanism by night and open it by day,`a star wheel located near thehour hand post and having a series of prongs representing the days ofthe week and engaged by means on said post and moved one step with eachrevolution of the hour hand, and

means controlled by the movement of said star wheel' for closing thealarm circuit through said time mechanism at predetermined, intervalsduring the day, substantially as described.

6. The combination, with a time mechanism, of an electric alarm circuit,av primary circuit closer comprising a rotary disk having insulating andconducting surfaces. and brushes forming the terminals of said alarmcircuit arranged to bear upon said disk, the circuit being brokenbetween said brushes when they are in contact with said insulatingsurface and closed between said brushes when they are in contact withsaid conducting surfaces, and said primary circuit closer` normallyclosing the circuit by night and and'means whereby at predeterminedintervals said circuit closing spring will be released to contact withsaid brushes and close the circuit between them, substantially asdescribed.

7. The combination, with a time mechan-I ism, of an electric alarmcircuit, a primary circuit closer, having brushes normally insulatedfrom one another and a rotary disk having insulating and conductingsurfaces with which said brushes alternately engage, a star wheel havingprongs representing the days of the week and in the path of the hourhand and actuated thereby one step with each revolution of said hand, aratchet provided in connection with said star wheel and having sevennotches, one of them being deeper than the others and a pivoted circuitclosing s ring having one end in engagement with sai ratchet andnormally held thereby out of contact with said brushes but adapted todrop into engagement therewith once with every revolution of saidratchet, or every seventh day, substantially as described.

8. The combination, with a time mechanism, of an electric alarm circuit,a primary circuit closer arranged to close the circuit through saidmechanism by night and open it by day, a secondary circuit closercomprising a revolving device actuated by the movement of the hour handpost, a ratchet pro-- vided in connection with said revolving device andhaving a series of notches, one of them deeper than the others, andmeans in engagement with said notches and arranged to close said alarmcircuit once with every revolution of said ratchet or when saidmeansengages the deeper notch, substantially as described.

9. The combination, with a time mechanism, of an electric circuit, aprimary circuit closer having brushes normally insulated from oneanother, and a rotary disk having insulating and conducting surfaceswith which said brushes alternately engage, means actuated one step witheach revolution of said hand, a circuit closing spring arranged toengage said brushes, and means interposed between said spring and saidactuated-means for normally holding said spring out of engagement withsaid brushes but permitting its contact `therewith at predeterminedintervals, substantially as described.

10. The combination, with a time mechanism, of an electric alarmcircuit, a primary circuit closer arranged to close the circuit throughsaid mechanism by night and open it by day, and a secondary circuitcloser comprising means actuated one step with each revolution of thehour hand, a circuit closing spring, means normally holding said circuitclosing spring out of contact with said primary circuit closer, and saidmeans being actuated by the movement of said actuatedmeans forpermitting the contact of said spring with said primary circuit closerat predetermined intervals.

In witness whereof, I have hereunto set my hand this l26th day of July1906.

FREDERICH J. ARNDT.

Witnesses:

RICHARD PAUL, J. B. ERA.

